.TSR FILE READER / VIEWER
Verify the Authenticity of a Content (.tsr Viewer)
Confirm integrity and legal validity of press releases with our RFC 3161 timestamp verifier.
Client-side processing • SHA-256 hash match • eIDAS-grade proof of existence
Processing happens locally in your browser — no files are uploaded to our servers.
What the Verification Confirms
SHA-256 IntegrityExact match between the document hash and the hash sealed inside the .tsr file.
RFC 3161 TimestampTrusted time evidence proving the press release existed at a specific date and time (eIDAS-compliant if selected).
JSON EvidenceMachine-readable technical details (hash, timestamp, TSA signature) for audit and chain of custody.
Privacy by DesignVerification runs client-side. Nothing leaves your browser.
Court-ReadyEvidence aligned with eIDAS and digital forensics best practices, suitable for independent checks.
Direct Access
Page Overview
What is a .tsr file?
A .tsr (TimeStamp Response) is the official receipt issued by a trusted timestamp authority (TSA).
It includes the timestamp, the SHA-256 hash of the content, and the TSA digital signature.
When the hash in the .tsr matches your document’s hash, integrity is proven; the valid timestamp proves existence at that time.
How the verification works
Steps
- Open the verifier: tsr-viewer.certifiedpressreleases.com
- Upload the .tsr file received with the certified press release (max 10 KB).
- (Optional) Paste the document’s SHA-256 hash to compare, or calculate it locally.
- Click Verify and check for HASH MATCH and a valid timestamp.
How to compute SHA-256 locally
- macOS / Linux:
sha256sum file.pdf - Windows:
certutil -hashfile file.pdf SHA256
Legal and forensic relevance
The RFC 3161 timestamp is a digital proof of existence recognized under European frameworks (eIDAS).
Combined with the SHA-256 integrity check, it provides strong evidence that a press release is authentic
and unaltered since certification, supporting compliance, audits, and independent expert verification.
- Prevents backdating and tampering allegations.
- Enables verifiable audit trails for corporate communications.
- Facilitates verification by courts, regulators, and forensic experts.
tsr-viewer.certifiedpressreleases.com
Privacy & Security
The verifier is hosted on a hardened subdomain and designed for client-side processing.
Files and hashes do not leave your browser. You may also download a JSON with technical details
(timestamp, hash, TSA info) to preserve your chain of custody.
Disclaimer: if any discrepancy arises between a web transcription and the certified PDF,
the digitally signed PDF remains the only legally valid reference.
Start the Verification
tsr-viewer.certifiedpressreleases.com
CertifiedPressReleases.com helps organizations publish, archive, and verify tamper-proof press releases with
SHA-256 hashing and eIDAS-grade timestamps.
Verify by DAPI helps establish who is real online. A public identity verification baseline designed to deter impersonation and deepfakes.